CN100357152C - Engine mounting structure for motorcycle - Google Patents

Abstract

The invention provides an engine installation structure of an automatic motorcycle, which fully ensures the sense of unity between the vehicle frame and the engine when the automatic motorcycle is turning, and further reduces the running vibration transmitted from the engine to the vehicle frame. The installation structure of the automatic two-wheel vehicle engine is as follows, the rear wheel supports the rocker arm and the rear wheel and swings up and down together, and is clamped by a pair of left and right engine side brackets (103), (103) that are arranged on the engine (16). The vehicle body side bracket (126) of the vehicle frame (11) has two sides in the vehicle body width direction, and the engine is mounted on the vehicle body side bracket through elastic members (135), (135). The vehicle frame has a pair of left and right auxiliary brackets (151), (151), which are arranged at intervals on both sides of the vehicle body side bracket, and the left and right engine side brackets are clamped by these auxiliary brackets. The engine support bolts (136) pass through the brackets on the vehicle body side, the left and right engine side brackets, and the left and right auxiliary brackets to connect the brackets.

Description

Engine installation structure of automatic two-wheel vehicle

technical field

This aspect relates to an engine mounting structure of a motorcycle.

Background technique

In a motorcycle, an engine is attached to a vehicle frame, and a rear wheel support swing arm is attached to the engine so as to be able to swing up and down (for example, refer to Patent Document 1).

[Patent Document 1] Japanese Unexamined Publication No. 2002-79983 (Fig. 5-6)

The conventional engine mounting structure for a motorcycle disclosed in Patent Document 1 is as follows. In the vehicle frame, a beam is erected between a pair of left and right frame members, and a vehicle body side is provided approximately in the middle of the beam. Brackets, a pair of left and right engine side brackets provided on the engine clamp the two sides of the vehicle body side bracket in the vehicle body width direction, and the engine is mounted on the vehicle body side brackets through the engine support bolts and elastic components , and the rocker arm for supporting the rear wheel is installed on the engine so that it can swing up and down.

When a motorcycle is running, the rear wheels vibrate according to the road conditions, and this vibration (hereinafter referred to as "driving vibration") is transmitted from the rear wheels to the engine through the rocker arm. Since the running vibration can be moderated by the elastic member, it is difficult to transmit from the engine to the vehicle frame.

In this configuration, in order to further reduce the running vibration transmitted from the engine to the vehicle frame, it may be considered to reduce the hardness of the elastic member. However, in situations such as turning an automatic motorcycle, it is required to secure a sense of unity between the frame and the engine. Therefore, there is a limit to simply lowering the hardness of the elastic member.

Contents of the invention

The object of the present invention is to provide a technology that can meet the requirements of both: (1) fully ensuring the sense of unity between the frame and the engine when turning a motorcycle, etc.; Driving vibration transmitted to the frame.

In the engine mounting structure of a motorcycle according to the first aspect of the present invention, the rear wheel and the rocker arm for supporting the rear wheel swing up and down at the same time, and are clamped by a pair of left and right engine side brackets provided on the engine. On both sides of the vehicle body side bracket in the width direction of the vehicle body, the engine is mounted on the vehicle body side bracket through elastic components, and the characteristics are as follows:

The vehicle frame has a pair of left and right auxiliary brackets, and the left and right pair of engine side brackets are sandwiched by the left and right pair of auxiliary brackets. The left and right pair of auxiliary brackets are arranged on the vehicle body side with intervals on both sides of the bracket,

These brackets are connected by passing engine support bolts through the bracket on the vehicle body side, the pair of left and right engine side brackets, and the pair of left and right auxiliary brackets.

The second aspect of the present invention is characterized in that: at least one of the pair of left and right auxiliary brackets is composed of the following components: a bracket base half provided on the vehicle frame; and a bracket detachably mounted on the bracket base half. The bracket front end half is connected to the engine side bracket by engine support bolts.

The third aspect of the present invention is characterized in that the structure is as follows, the vehicle frame is at a position different from the vehicle body side bracket and the pair of left and right auxiliary brackets, and above the swing center of the rocker arm for supporting the rear wheel, left and right A pair of upper brackets on the side of the vehicle body, the above-mentioned rocker arm for supporting the rear wheel is mounted on the engine so as to be able to swing,

And the engine is on a position different from the left and right pair of engine side brackets, and the engine side upper bracket is set above the swing center,

The engine side upper bracket is sandwiched between the left and right pair of vehicle body side upper brackets, so that the upper part of the engine can be attached to the left and right pair of vehicle body side upper brackets through the upper elastic member.

The fourth aspect of the present invention is characterized in that the vehicle frame is provided with a beam disposed below the cylinder head of the engine and extending in the width direction of the vehicle body, and the vehicle body side bracket extends rearward and upward from the beam, On the other hand, the left and right pair of bracket base halves extend upward from the beam, and the left and right pair of bracket front end halves extend from the left and right pair of bracket base halves toward the vehicle body side bracket side. extended and connected by engine support bolts so that the vehicle body side bracket, bracket base half, and bracket front end half are arranged in a substantially triangular shape when viewed from the vehicle body side.

A fifth aspect of the present invention is characterized in that the pair of left and right bracket base halves are substantially L-shaped when viewed from the front end side.

A sixth aspect of the present invention is characterized in that the left and right pair of bracket front end halves are connected to the left and right pair of bracket base halves at two points each up and down, and are connected to the engine at one connection point based on the engine support bolt.

The seventh feature of the present invention is that: at least one of the left and right sides between the left and right pair of engine side brackets and the left and right pair of auxiliary brackets is installed with a collar with a flange passing through the engine support bolts, so that the flange Face the end face of the engine side bracket on the side where the flanged collar is installed.

Effect of the present invention is:

According to the first aspect of the present invention, since the vehicle frame is provided with a pair of left and right auxiliary brackets arranged at intervals on both sides of the vehicle body width direction of the vehicle body side bracket in addition to the vehicle body side bracket, Therefore, the left and right pair of engine side brackets are further clamped by the left and right auxiliary brackets, and the engine support bolts are inserted between these brackets to connect these brackets. The left and right pair of engine side brackets clamp The vehicle body side brackets are on both sides in the vehicle body width direction.

As a result, engine vibration relative to the vehicle frame can be controlled regardless of the hardness of the elastic member that mounts the engine to the bracket on the vehicle body side. Therefore, when the motorcycle is cornering, etc., the sense of unity between the frame and the engine can be sufficiently ensured, and the hardness of the elastic member can be reduced to further reduce the running vibration transmitted from the engine to the frame. Therefore, the riding comfort of the motorcycle equipped with the rocker arm for supporting the rear wheel on the engine can be further improved.

Furthermore, in the first aspect of the invention according to the present invention, since the engine side bracket is clamped by the pair of left and right auxiliary brackets which the vehicle frame has, it is possible to control the direction of the engine relative to the vehicle frame when the motorcycle is running. The relative change in the width direction of the body. Therefore, the riding comfort of the motorcycle can be further improved.

Furthermore, since the engine side bracket is sandwiched by the pair of left and right auxiliary brackets included in the vehicle frame, variations in mounting accuracy between the vehicle frame and the engine in the vehicle body width direction can be suppressed.

According to the second aspect of the present invention, by changing the rigidity of the front half of the bracket detachable from the base half of the bracket (for example, changing the rigidity by changing the shape, thickness, and material), it is possible to easily transfer the pair of left and right The support rigidity of the auxiliary bracket supporting the engine is adjusted to the best state.

According to the third aspect of the present invention, since the position of the bracket on the vehicle body side and the pair of auxiliary brackets on the left and right is different from that in the vehicle frame, and it is above the swing center of the rocker arm for supporting the rear wheel swingably installed on the engine, , The engine side upper bracket is sandwiched by the left and right pair of vehicle body side upper brackets, so the upper part of the engine can be installed on the left and right vehicle body side upper brackets by the upper elastic member.

The upper elastic members of the left and right vehicle body side upper brackets located above the swing center can also absorb and moderate the running vibration transmitted from the rear wheels to the engine through the rocker arms. Therefore, the riding comfort of the motorcycle can be further improved.

Furthermore, the support rigidity of the support portion where the left and right vehicle body side upper brackets independently support the engine is lower than the support rigidity of the support portion where the vehicle body side bracket and the pair of left and right auxiliary brackets cooperatively support the engine. In this way, it is possible to control the load on the support portion supporting the engine by the left and right vehicle body side upper brackets located above the swing center of the rocker arm.

According to the fourth aspect of the present invention, since the engine support portion is configured to have a substantially triangular shape when viewed from the vehicle body side, the support rigidity can be further improved.

According to the fifth aspect of the present invention, the pair of left and right bracket base halves are substantially L-shaped when viewed from the front end side, so that the support rigidity can be improved with a simple configuration.

According to the sixth aspect of the present invention, when the bracket front end half is viewed from the vehicle body side, the bracket front end half is connected to the vehicle body side bracket and the bracket provided on the vehicle frame at three points of approximately triangular shape. The base half body can therefore improve the joint rigidity and support rigidity of the front end half body of the bracket.

In accordance with the seventh aspect of the present invention, between the engine side bracket and the auxiliary bracket, a collar with a flange passing through the engine support bolt is assembled. As a result, a space that is only a part of the length of the collar can be provided between the left and right sub-brackets. And when the engine is assembled on the vehicle frame, the collar with the flange is finally assembled. Since the space of only a portion of the axial length of the collar is vacated, it is easy to align the positions of the left and right engine side brackets between the engine side bracket and the left and right auxiliary brackets.

Therefore, the assemblability is good without being affected by the complicated structure in which the pair of left and right engine side brackets are clamped by the left and right auxiliary brackets, and the engine support bolts are inserted between these brackets to connect them. , the left and right pair of engine side brackets sandwich the vehicle body side brackets on both sides in the vehicle body width direction.

In addition, since the flange of the collar is assembled toward the end surface of the bracket on the engine side, the load in the vehicle body width direction from the bracket on the engine side can be more sufficiently prevented.

Description of drawings

Fig. 1 is a left side view of the motorcycle of the present invention.

Fig. 2 is a left side view of the engine and the power transmission mechanism of the present invention.

Fig. 3 is a sectional view taken along line 3-3 in Fig. 2 .

Fig. 4 is a left side view of the vehicle frame of the present invention.

Fig. 5 is a left side view of the rear part of the vehicle frame, the engine and the power transmission mechanism of the present invention.

Fig. 6 is a plan view of the engine mounting portion of the present invention.

Fig. 7 is a left side view of a third mounting structure of the engine.

Fig. 8 is an exploded view of a third mounting structure of the engine.

Symbol Description

10 automatic two-wheel vehicle; 11 vehicle frame; 16 engine; 17 rear wheel; 55 cylinder head; 88 rocker arm for rear wheel support; 101 engine side upper bracket; frame; 123, 126 car body side bracket; 125 beam (second beam); 131 upper elastic part; 132, 134, 136 engine support bolt; 133, 135 elastic part; Lan; 145 collar; 152 bracket base half body; 153 bolts; 154 bracket front end half body; swing center of P2 rear fork.

Detailed ways

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In addition, "front", "rear", "left", "right", "upper", "downward" are directions viewed from the driver's side, and Fr indicates the front side, Rr indicates the rear side, L indicates the left side, R indicates the right side, and CL indicates the vehicle body center (vehicle width center). In addition, the drawings are diagrams viewed from the direction of the symbols.

Fig. 1 is a left side view of the motorcycle of the present invention.

The automatic two-wheel vehicle 10 is a kind of small motorcycle type automatic two-wheel vehicle, mainly composed of: a vehicle frame 11; a front fork 13 installed on the head pipe 12 of the vehicle frame 11; a front wheel 14 installed on the front fork 13; Be connected to the handle 15 of front fork 13; Be installed in the motor 16 of vehicle frame 11 rear parts; Be installed in the power transmission mechanism 17 that can swing up and down on the engine 16; Be installed in the rear wheel 18 on the power transmission mechanism 17; The rear end portion of 17 is suspended on the rear buffer unit 19 on the vehicle frame 11; the storage box 21 installed on the rear upper part of the vehicle frame 11; and the switchable seat 22 arranged on the storage box 21. Seat 22 is a double seat.

Furthermore, the motorcycle 10 covers the frame 11 with the vehicle body cover 30 . The vehicle body cover 30 includes: a front cover 31 covering the front of the head pipe 12; an inner cover 32 covering the rear of the front cover 31; left and right floor steps 33 for placing the driver's feet; The left and right lower skirts 34 extending downward from the outer edge of the low bed type pedal 33; the center cover 35 extending rearward from the inner cover 32 and covering the center of the length direction of the vehicle frame 11; A rear cover 36 covering the rear of the vehicle frame 11 .

In the figure, 37 is a handle cover, 38 is a front fender, 39 is a rear fender, 41 is a windshield, 42 is a radiator for engine cooling, 43 is a fuel tank, and 44 is a rear passenger pedal , 45 is an air filter, 46 is a connecting tube (connecting tube), 47 is an air chamber, 48 is an engine exhaust pipe, and 49 is a muffler for exhaust.

Fig. 2 is a left side view of the engine and the power transmission mechanism of the present invention.

The engine 16 is a four-stroke two-cylinder water-cooled engine, and the cylinder 54 extends forward from the crankcase 52 . Let the axis of the cylinder 54 be L1.

The engine 16 is provided with a starter motor 161 on the upper part of the crankcase 52; a cam chain tensioner lifter 162 is provided on the upper part of the cylinder block 53;

Fig. 3 is a sectional view taken along line 3-3 in Fig. 2 . The casing portion of the engine 16 is composed of the following components: a crankcase 52 formed by bolting the left and right casing halves 51L, 51R; a cylinder block 53 bolted to the front of the crankcase 52; The left and right cylinders 54, 54; the cylinder head 55 that is bolted to the front of the cylinder block 53; the combustion chambers 56, 56 that are formed in the cylinder head 55; the cylinder head cover 57 that is bolted to the front of the cylinder head 55; And a valve chamber (pump chamber) 58 formed between the cylinder head 55 and the cylinder head cover 57 .

In addition, the engine 16 is composed of the following components: a crankshaft 61 is rotatably mounted on the crankcase 52 and extends left and right; Reciprocating motion; and the valve power transmission mechanism 64 housed in the valve chamber 58 .

By bolting the generator cover 66 to the right side of the right casing half body 51R, a generator housing chamber 67 is formed between the right casing half body 51R and the generator cover 66, and the generator 68 It is housed in the generator housing chamber 67 . The generator 68 is connected to the right end of the crankshaft 61 .

Since the generator cover 66 is fixed to the crankcase 52 , in the present invention, the generator cover 66 is used as a part of the crankcase 52 .

The power transmission mechanism 17 is composed of the following components: a transmission mechanism box 72, the front part is mounted on the left casing half body 51L through a bearing 71 so that it can swing up and down, and extends backward; the side opening of the transmission mechanism box 72 is blocked. The box cover 73; the transmission mechanism storage chamber 74 formed between the transmission mechanism box 72 and the box cover 73; and the transmission mechanism 75 housed in the transmission mechanism storage chamber 74. The transmission mechanism case 72 is formed with a boss portion 76 protruding halfway in the longitudinal direction to the side of the vehicle width center.

The transmission mechanism 75 is a combined structure of a belt-type transmission mechanism 75A connected to the crankshaft 61 and a gear mechanism 75B connected to the belt-type transmission mechanism 75A, and the rear wheel axle 77 is connected to the output side of the gear mechanism 75B and is rotatably supported. The rear wheel axles 77 and 78 are covers covering the outside of the tank cover 73 in the vehicle body width direction.

On the other hand, the generator cover 66 is provided with a front arm 81 so as to be able to swing up and down. Specifically, the support shaft 82 is integrally provided on the front portion of the front arm 81 , and the support shaft 82 is rotatably supported on the generator cover 66 via the bearing 83 .

The front arm 81 extends rearward, and the boss portion 84 protrudes from the rear end along the rear portion of the crankcase 52 to the center side of the vehicle width, and the boss portion 76 of the transmission mechanism case 72 is connected to the arm by bolts 85 and 85 . Boss portion 84 . In addition, the front arm 81 connects the rear arm 86 to the rear with bolts 87 . On the other hand, the rear arm 86 extends rearward, and supports the rear wheel axle 77 at its rear end so as to be rotatable.

The combined structure of the transmission mechanism case 72 and the front and rear arms 81 and 86 constitutes a rear fork (rocker arm) 88 that is substantially H-shaped in plan view. Therefore, the front part of the rear fork 88 which supports the rear wheel 18 via the rear wheel axle 77 can be attached to the crankcase 52 so that it can swing up and down. Therefore, the rear fork 88 can swing up and down simultaneously with the rear wheel 18 .

The present invention is characterized in that the swing center P2 of the rear fork 88 , that is, the swing center P2 of the transmission mechanism case 72 and the front arm 81 is made to coincide with the center P1 of the crankshaft 61 .

Assuming that the swing center P2 of the rear fork 88 is inconsistent with the center P1 of the crankshaft 61 (deviation), the swing angle of the mechanism (transmission mechanism) that transmits power from the crankshaft 61 to the rear wheel 18 will also be the same as the swing of the rear fork 88. The corners are different. Therefore, the configuration of the transfer mechanism inevitably becomes complicated.

In contrast, in the present invention, the swing center P2 of the rear fork 88 coincides with the center P1 of the crankshaft 61 . Specifically, by directly coupling the drive pulley 79 of the transmission mechanism 75 to the crankshaft 61 , the center of the input side of the transmission mechanism 75 and the swing center P2 of the transmission mechanism case 72 coincide with the center P1 of the crankshaft 61 . As a result, the swing angle of the transmission mechanism 75 is the same as the swing angle of the rear fork 88 . Therefore, the transmission mechanism 75 (a mechanism that transmits power from the crankshaft 61 to the rear wheels 18) can be simplified.

In addition, this figure shows that the rear end of the transmission mechanism box 72 and the rear end of the rear arm 86 are provided with the bracket 89,89 which connects the lower part of the left and right rear damper unit 19,19.

Here, return to FIG. 2 to continue the description. The cylinder head 55 is integrally formed with an intake port 92 connected to the combustion chamber 56 and provided with an intake valve 91 , and an exhaust port 94 connected to the combustion chamber 56 and provided with an exhaust valve 93 . When the engine 16 is viewed from the side, the intake port 92 opens upward, and the exhaust port 94 opens downward.

An intake pipe 95 connected to the intake port 92 extends toward the rear of the cylinder head 55, and a throttle valve (throttle valve) 96 is connected to the rear end (upstream end) of the intake pipe. The upstream end of the throttle valve 96 faces rearward. The intake pipe 95 is fitted with a fuel injection device (injector) 97 that injects fuel toward the intake valve 91 .

The combined structure of the intake port 92 , the intake pipe 95 and the throttle valve 96 constitutes the intake passage 98 . In other words, the intake passage 98 extends rearward from the upper portion of the cylinder 54 , and the intake port of the intake passage 98 faces rearward. Furthermore, as shown in FIG. 1 above, the intake port of the intake passage 98 , that is, the upstream end of the throttle valve 96 is connected to the air cleaner 45 through the air chamber 47 . In addition, 99 and 99 denote camshafts of the valve train 64 .

In the engine 16 , an upper mounting bracket 101 and a lower mounting bracket 102 are provided on the crankcase 52 , and a front mounting bracket 103 is provided on the lower portion of the cylinder head 55 . Specifically, an upper mounting bracket 101 is provided above the cylinder 54 , and a lower mounting bracket 102 and a front mounting bracket 103 are provided below the cylinder 54 .

In addition, the upper mounting bracket 101 may be appropriately referred to as "the engine side upper bracket 101 provided on the engine 16". Furthermore, the lower mounting bracket 102 and the front mounting bracket 103 may also be appropriately referred to as "engine side brackets 102, 103 provided on the engine 16".

Fig. 4 is a left side view of the vehicle frame of the present invention. The vehicle frame 11 is a double cradle type vehicle frame, and its main beam 111 extends rearward and downward from the head tube 12, and the seat rail 112 extends rearward and upward midway along the length direction of the main beam 111. On the other hand, Below the main beam 111, the lower beam 113 extends rearward and downward from the head tube 12, and the bottom beam 114 extends rearward from the lower end of the lower beam 113, so that the lower end of the main beam 111 is joined to the middle of the length direction of the lower beam 114, so that the upper The beam 115 (stand member) extends rearward and upward from the rear end of the lower beam 114 , and the rear end of the upper beam 115 is joined to the midway in the longitudinal direction of the seat rail 112 .

This figure shows that upper brackets 116 , 116 connecting the left and right rear shock absorber units 19 , 19 (only the front left side is shown in this figure. The same applies below.) are provided at the rear portion of the seat rail 112 . By connecting the rear buffer unit 19, 19 between the brackets 89, 89 of the rear fork 88 and the brackets 116, 116 of the seat rail 112, the rear fork 88 can be adjusted by the rear buffer unit 19, 19. The rear portion is suspended on the vehicle frame 11 left and right.

Fig. 5 is a left side view of the vehicle frame rear part, engine and power transmission mechanism of the present invention. The left and right upper beams 115, 115 (only the front left side is shown in the figure, the same applies hereinafter) as the stand members of the vehicle frame 11 are approximately perpendicular to the cylinder 54 when viewed from the side, that is, approximately perpendicular to the axis L1 of the cylinder. parts. Left and right upper beams 115 , 115 are provided with left and right upper brackets 121 , 121 at their upper ends, and a first beam 122 is bridged between their lower ends, and a lower bracket 123 is provided on the first beam 122 . On the other hand, the left and right main pipes 111 , 111 span the second beam 125 between the lower ends, and the front bracket 126 is provided on the second beam 125 . In this way, the second beam 125 is arranged below the cylinder head 55 of the engine 16 and extends in the vehicle body width direction to be provided on the body frame 11 .

Let L2 be a line passing through the center P1 of the crankshaft 61 and the center P3 of the rear wheel axle 77 .

FIG. 6 is a plan view of the engine mounting portion of the present invention, and shows a structure in which the engine 16 is mounted on the body frame 11 indicated by a dotted line.

As mentioned above, this Fig. 6 shows: (1) left and right upper brackets 121, 121 are provided in the left and right upper beams 115, 115; A lower bracket 123 is provided on the first beam 122, and a tubular lower pivot portion 124 extending in the vehicle body width direction (left and right) is provided on the lower bracket 123; and (3) between the left and right main pipes 111, 111 The second beam 125 is erected, and a front bracket 126 is provided on the second beam 125, and a tubular front pivot portion 127 is provided on the front bracket 126 extending in the vehicle body width direction (left and right).

In addition, the upper bracket 121 may be appropriately referred to as "the vehicle body side upper bracket 121 provided on the vehicle frame 11". Furthermore, the lower bracket 123 and the front bracket 126 may also be appropriately referred to as "vehicle body side brackets 123 and 126 provided on the vehicle frame 11".

Furthermore, the vehicle frame 11 has: (1) a pair of left and right auxiliary brackets 141, 142 arranged at intervals on both sides of the lower bracket 123 located in the center of the vehicle width; (2) a pair of left and right auxiliary brackets 151, 151 are arranged at intervals on both sides of the front bracket 126 located in the center of the vehicle width.

Specifically, the vertical plate-shaped left auxiliary bracket 141 extends rearwardly from the left side of the first beam 122 , and the right auxiliary bracket 142 is fixed along the right upper beam 115 and extends rearwardly from the upper beam 115 . Furthermore, left and right auxiliary brackets 151 , 151 are provided on both left and right sides of the second beam 125 .

The first mounting structure of the engine 16 is that the left and right upper mounting brackets 101, 101 provided on the crankcase 52 are provided with holes for bushings 101a, 101a, and annular rubber bushes 131, 131 are fitted into these. Rubber bushes 131 , 131 and left and right upper brackets 121 , 121 are collectively fixed to bushing holes 101 a , 101 a via one pivot shaft 132 extending left and right.

In the second mounting structure of the engine 16, the left and right lower mounting brackets 102, 102 provided on the crankcase 52 are provided with bushing holes 102a, 102a, and annular rubber bushes 133, 133 are fitted into the Rubber bushes 133 , 133 and the lower pivot portion 124 are collectively fixed to these bush holes 102 a , 102 a by one pivot 134 extending left and right.

That is, in the second mounting structure, the pair of left and right lower mounting brackets 102, 102 sandwich the both sides of the lower bracket 123 in the vehicle body width direction, that is, both sides of the lower pivot portion 124, and the rubber bushes 133, 133 installs the engine 16 on the lower bracket 123 .

In the third mounting structure of the engine 16, bushing holes 103a, 103a are opened in the left and right front mounting brackets 103, 103 provided on the cylinder head 55, and ring-shaped rubber bushes 135, 135 are fitted. Rubber bushes 135 , 135 and the front pivot portion 127 are collectively fixed to these bush holes 103 a , 103 a by one pivot 136 extending left and right.

That is, in the third mounting structure, the pair of left and right front mounting brackets 103, 103 clamp the both sides of the front bracket 126 in the vehicle body width direction, that is, both sides of the front pivot portion 127, and the rubber bushes The sleeves 135 , 135 mount the engine 16 to the bracket 123 on the vehicle body side.

The rubber bushes 131 , 133 , and 135 are vibration-absorbing elastic members of the engine 16 . The rubber bush 131 may be appropriately called an "upper elastic member". Instead, the rubber bushes 133 and 135 are appropriately called "elastic members".

The pivots 132, 134, and 136 are composed of engine support bolts, that is, bolts and nuts. In the figure, 137 ... (... represents a plural number. The same applies hereinafter.) are elastic members for absorbing vibrations left and right of the engine 16, and 138 ... are collars.

The present invention is characterized in that the engine 16 is mounted on the vehicle frame 11 through rubber bushes 131, 133, 135 (elastic parts) in such a way, that is, elastic (rubber) mounted.

The first, second, and third attachment structures of the engine 16 will be described in more detail based on FIGS. 5 to 8 .

Fig. 7 is a left side view of a third mounting structure of the engine. Fig. 8 is an exploded view of a third mounting structure of the engine.

As shown in FIG. 6 , the second mounting structure of the engine 16 is characterized in that it is configured such that a pair of left and right auxiliary brackets 141 , 142 sandwich a pair of left and right lower mounting brackets 102 , 102 , and the pivot shaft 134 These brackets 123, 102, 102, 141, 142 are connected by passing through the lower bracket 123, the pair of left and right lower mounting brackets 102, 102, and the pair of left and right auxiliary brackets 141, 142. 143 is a washer.

In this way, in the second mounting structure, on the vehicle frame 11, in addition to the lower bracket 123 (vehicle side bracket), left and right brackets arranged at intervals on both sides in the vehicle body width direction of the lower bracket 123 are provided. A pair of auxiliary brackets 141, 142 can further clamp the left and right pair of lower mounting brackets (engine side brackets) 102, 102 through the left and right auxiliary brackets 141, 142, so that the pivot (engine support bolt) ) 134 penetrates and connects between the brackets 123, 102, 102, 141, 142, and the left and right pair of lower mounting brackets 102, 102 sandwich the lower bracket 123 on both sides in the vehicle body width direction.

As a result, irrespective of the hardness of the rubber bushes (elastic members) 133, 133 that mount the engine 16 on the lower bracket 123, the movement of the engine 16 relative to the vehicle frame 11 in the vehicle body width direction, up and down, and front and rear directions can be controlled. vibration. Therefore, in the case of turning and running the motorcycle 10 (see FIG. 5 ), etc., the sense of unity between the vehicle frame 11 and the engine 16 can be sufficiently ensured, and the hardness of the rubber bushes 133, 133 can be reduced, thereby further reducing the friction of the engine 16. Traveling vibration is transmitted to the vehicle frame 11 . Therefore, the riding comfort of the motorcycle 10 in which the rear fork (swing arm for supporting the rear wheel) 88 shown in FIG. 5 is attached to the engine 16 can be further improved.

Furthermore, in the second mounting structure, since the lower mounting brackets 102, 102 are clamped by the pair of left and right auxiliary brackets 141, 142 positioned on the vehicle frame 11, it is possible to control The engine 16 changes relative to the vehicle body width direction, up and down, and front and rear directions relative to the vehicle frame 11 . Therefore, the riding comfort of the motorcycle 10 can be further improved.

Furthermore, since the lower mounting brackets 102, 102 are clamped by the pair of left and right auxiliary brackets 141, 142 positioned on the vehicle frame 11, the installation accuracy of the vehicle frame 11 and the engine 16 in the vehicle body width direction can be suppressed. deviation.

Furthermore, since a pair of left and right sub-brackets 141, 142 with a gap are provided on both sides in the vehicle body width direction of the lower bracket (vehicle side bracket) 123, the pivot shaft (engine support bolt) 134 can be further enlarged. The supporting interval can ensure the sense of unity between the vehicle frame 11 and the engine 16 more effectively.

Furthermore, in the second mounting structure, a collar 145 with a flange 144 passing through the pivot 134 is mounted between the right lower mounting bracket 102 and the right auxiliary bracket 142 . The flange 144 faces the right end face of the lower mounting bracket 102 and faces the end face of the lower mounting bracket 102 through the left and right vibration absorbing elastic members 137 .

Thus, in the second mounting structure, the collar 145 with the flange 144 passing through the pivot shaft 134 is provided between the lower mounting bracket 102 and the auxiliary bracket 142 . As a result, a space that is only the length of the collar 145 can be provided between the left and right sub-brackets 141 and 142 .

In order to assemble the engine 16 on the vehicle frame 11, after the left and right lower mounting brackets 102, 102 are positioned between the lower bracket 123 and the left and right auxiliary brackets 141, 142, a belt method is provided between them. The collar 145 of the flange 144 is then assembled by passing the pivot 134 through each of the brackets 123, 102, 102, 141, 142 and the collar 145. In this way, when the engine 16 is assembled on the vehicle frame 11, the collar 145 with the flange 144 may be assembled last. Since the space is only part of the axial length of the collar 145 , the left and right lower mounting brackets 102 , 102 can be easily positioned between the lower bracket 123 and the left and right auxiliary brackets 141 , 142 .

Therefore, the assemblability is good without being affected by the complex structure in which the left and right pair of lower mounting brackets 102, 102 are clamped by the left and right auxiliary brackets 141, 142, and the pivot shaft 134 is penetrated and connected to the Between these brackets 123 , 102 , 102 , 141 , and 142 , the pair of left and right lower mounting brackets 102 , 102 sandwich both sides of the lower bracket 123 in the vehicle body width direction.

Furthermore, since the flange 144 of the collar 145 is assembled toward the end surface of the lower mounting bracket 102 , the load in the vehicle body width direction from the lower mounting bracket 102 can be further sufficiently prevented.

As shown in FIG. 6 , the third mounting structure of the engine 16 is characterized in that it is configured such that a pair of left and right auxiliary brackets 151, 151 clamp a pair of left and right front mounting brackets 103, 103, and pivot 136 passes through the front bracket 126 , the pair of left and right front mounting brackets 103 , 103 , and the pair of left and right auxiliary brackets 151 , 151 to connect these brackets 126 , 103 , 103 , 151 , 151 .

In this way, in the third mounting structure, on the vehicle frame 11, in addition to the front bracket (vehicle side bracket) 126, there are also provided on both sides of the front bracket 126 in the vehicle width direction at intervals. A pair of left and right auxiliary brackets 151, 151, so that the left and right pair of front mounting brackets (engine side brackets) 103, 103 can be clamped by the left and right auxiliary brackets 151, 151, and the pivot 136 penetrates and connects between these respective brackets 126 , 103 , 103 , 151 , and 151 , and the pair of left and right front mounting brackets 103 , 103 clamp both sides of the front bracket 126 in the vehicle body width direction.

As a result, irrespective of the hardness of the rubber bushes (elastic members) 135, 135 that mount the engine 16 on the front bracket 126, the position of the engine 16 relative to the vehicle frame 11 in the vehicle body width direction, up and down, and front and rear directions can be controlled. vibration. Therefore, in the case of turning the motorcycle 10 (refer to FIG. 5 ), etc., the sense of unity between the vehicle frame 11 and the engine 16 can be sufficiently ensured, and the hardness of the rubber bushes 135, 135 can be reduced, thereby further reducing the pressure from the engine 16. Running vibration transmitted to the frame 11. Therefore, the riding comfort of the motorcycle 10 in which the rear fork 88 is attached to the engine 16 shown in FIG. 5 can be further improved.

Furthermore, in the 3rd mounting structure, since the front mounting brackets 103, 103 are clamped by the pair of left and right auxiliary brackets 151, 151 positioned on the vehicle frame 11, it is possible to The engine 16 is controlled to produce relative changes in the vehicle body width direction with respect to the vehicle frame 11 . Therefore, the riding comfort of the motorcycle 10 can be further improved.

Furthermore, since the front mounting brackets 103, 103 are clamped by the pair of left and right auxiliary brackets 151, 151 positioned on the vehicle frame 11, it is possible to restrain the mounting accuracy of the vehicle frame 11 and the engine 16 in the vehicle width direction. deviation.

As shown in Figures 6 to 8, a pair of left and right auxiliary brackets 151, 151 are composed of the following components: bracket base halves 152, 152 arranged on the vehicle frame 11; The bracket front half 154, 154 is mounted on the bracket base half 152, 152, and the bracket front half 154, 154 is connected to the front mounting bracket 103, 103 by the pivot 136 And on the front bracket 126.

In this way, by changing the rigidity of the bracket front end half body 154, 154 detachable from the bracket base half body 152, 152 (for example, changing the rigidity by changing the shape, plate thickness, and material), it is possible to easily convert the left and right sides. The supporting rigidity of the pair of auxiliary brackets 151 and 151 supporting the engine 16 is adjusted to an optimal state.

Furthermore, the third mounting structure is characterized in that it is configured such that the front bracket 126 extends rearward and upward from the second cross beam 125, while on the other hand, a pair of left and right bracket base halves 152, 152 extend from the second beam 125. The crossbeam 125 extends upward, and the left and right pair of bracket front end halves 154, 154 extend from the left and right pair of bracket base halves 152, 152 toward the front bracket 126 side, and are connected by a pivot 136. This is roughly triangular in shape when viewed from the vehicle body side.

That is, the third mounting structure is configured such that the front bracket 126 , the bracket base half 152 , and the bracket front end half 154 are arranged in a substantially triangular shape when viewed from the vehicle body side. In this way, since the third mounting structure, that is, the engine support portion is formed in a substantially triangular shape when viewed from the vehicle body side, the support rigidity can be further increased.

The left and right pair of bracket base half bodies 152, 152 have a substantially L-shape when viewed from the front end side. Accordingly, the support rigidity of the bracket base half bodies 152, 152 can be increased with a simple configuration.

The left and right pair of bracket front end half bodies 154, 154 are respectively connected to the left and right pair of bracket base half bodies 152, 152 by bolts 153, 153 at the upper and lower points. The connecting portion and the connecting point based on the pivot 136 are combined at three points.

That is, the left and right pair of bracket front end halves 154, 154 are coupled to the left and right pair of bracket base halves 152, 152 at two points each up and down, and are connected by one connection point based on the pivot (engine support bolt) 136. Combined with engine 16.

In this way, when the bracket front end half bodies 154, 154 are viewed from the vehicle body side, they are connected to the front bracket 126 provided on the vehicle frame 11 and the bracket base half bodies 152, 152 through three substantially triangular points. Therefore, the coupling rigidity and supporting rigidity of the bracket front end half bodies 154 and 154 can be improved.

As shown in FIGS. 5 and 6 , the first mounting structure of the engine 16 is characterized by the following configuration.

The vehicle frame 11 is at a position different from the lower bracket 123 or the front bracket 126 and the pair of left and right auxiliary brackets 141, 142 or auxiliary brackets 151, 151, and is swingably mounted on the rear of the engine 16. A pair of left and right upper brackets 121, 121 are provided above the swing center P2 of the fork (rear wheel support rocker arm) 88 .

The engine 16 is provided with upper mounting brackets 101, 101 at positions different from the pair of left and right lower mounting brackets 102, 102 or the pair of left and right front mounting brackets 103, 103, and above the swing center P2.

The feature of the first mounting structure is that it is configured as a pair of left and right upper brackets 121, 121, and the upper mounting brackets 101, 101 are clamped by the collars 138, 138, so that the rubber bushes 131, 131 hold the The upper portion of the engine 16 is mounted on a pair of upper brackets 121 , 121 .

In this way, in the first installation structure, the vehicle frame 11 is installed in a position different from the lower/front brackets 123, 126 and the pair of left and right auxiliary brackets 141, 142, 151, 151, and is installed in a swingable manner. Above the swing center P2 of the rear fork 88 on the engine 16, the upper mounting brackets (engine side upper brackets) 101, 101 are sandwiched by a pair of left and right upper brackets 121, 121, thereby passing through the rubber bushing (upper bracket) Elastic members) 131 , 131 attach the upper part of the engine 16 to the left and right upper brackets 121 , 121 .

The rubber bushes 131 , 131 of the left and right upper brackets 121 , 121 positioned above the swing center P2 can also absorb and moderate running vibration transmitted from the rear wheel 18 ( FIG. 4 ) to the engine 16 through the rear fork 88 . Therefore, the riding comfort of the motorcycle 10 can be further improved.

Furthermore, the support rigidity of the first mounting structure (support portion) of the left and right upper brackets 121, 121 independently supporting the engine 16 is lower than that of the lower/front brackets 123, 126 and the pair of left and right auxiliary brackets 141, 142, 151 , 151 cooperate to support the support rigidity of the second and third mounting structures (support parts) of the engine 16 . In this way, it is possible to suppress the load on the support portion of the engine 16 by the left and right upper brackets 121 , 121 located above the swing center P2 of the rear fork 88 .

Summarize the above description. As shown in FIGS. 5 and 6 , the first, second, and third mounting structures are characterized in that the upper mounting bracket 101 is fixed by mounting the rubber bush 131 on the upper bracket 121 above the cylinder 54 . The rubber bushing 131 is installed on the upper beam 115 and above the cylinder 54, and by installing the rubber bushing 133 on the lower bracket 123 below the cylinder 54, the lower mounting bracket 102 is mounted with the rubber bushing 133. Installed on the upper beam 115 and located below the cylinder 54 .

Furthermore, the present invention is characterized in that the rubber bush 131 for the upper mounting bracket 101 is disposed above the swing center P2 of the rear fork 88 , and the rubber bush 133 for the lower mounting bracket 102 is disposed above the swing center P2 of the rear fork 88 . Below center P2.

When the motorcycle 10 is running, the rear wheels 18 (see FIG. 4 ) vibrate in accordance with road conditions. This vibration is called "traveling vibration".

Since the engine 16 is mounted on the vehicle frame 11 through the rubber bushes (elastic members) 131, 133, 135, the running force transmitted from the rear wheel 18 to the engine 16 through the rear fork 88 can be eased by the rubber bushes 131, 133, 135. vibration, thereby making it difficult for the vibration to be transmitted to the vehicle frame 11. Therefore, the riding comfort of the motorcycle 10 in which the rear fork 88 is swingably attached to the crankcase 52 can be improved.

Furthermore, by extending the cylinder 54 forward from the crankcase 52 , spaces can be formed above and below the crankcase 52 . Utilizing these up and down remaining spaces, rubber bushes 131, 133 are disposed above and below the cylinder 54, and these rubber bushes 131, 133 are mounted on the upper beam 115, which is aligned with the cylinder when viewed from the side. 54 is approximately orthogonal. That is, the rubber bushes 131 and 133 are arranged above and below the swing center P2, respectively.

Therefore, it is easy to secure a space for disposing the rubber bushes 131, 133, and the structure of the body frame 11 to which the rubber bushes 131, 133 are attached is also simple. Furthermore, the distance between the upper and lower rubber bushes 131 and 133 can be sufficiently secured.

In addition, due to running vibration, moment acts on the crankcase 52 (cases) of the engine 16 around the upper rubber bush 131 or the lower rubber bush 133 . The larger the distance between the upper and lower rubber bushes 131, 133, the smaller the force acting on the upper or lower rubber bushes 131, 133 due to moment.

As described above, in the present invention, the rubber bushes 131 and 133 are arranged above and below the cylinder 54 . That is, the respective rubber bushes 131 and 133 are arranged above and below the swing center P2 of the rear fork 88 . Therefore, the distance between the rubber bushes 131, 133 can be set larger. As a result, since the force acting on the rubber bushes 131, 133 becomes smaller, the rubber bushes 131, 133 are more effective in absorbing vibration. Therefore, since the running vibration transmitted to the engine 16 is further moderated by the rubber bushes 131, 133, the vibration is less likely to be transmitted to the vehicle frame 11, and ride comfort can be further improved.

In addition, in the embodiment of the present invention, the motorcycle 10 is not limited to a scooter-type motorcycle.

The engine 16 is not limited to a two-cylinder engine, and may be a single-cylinder engine or a multi-cylinder engine.

The number of rear buffer units 19 is not limited to two on the left and right, but may be one.

The front arm 81 constituting the rear fork 88 can be directly attached to the crankcase 52 without passing through the generator cover 66 and can swing up and down.

The rear fork 88 is not limited to the combined structure of the transmission mechanism case 72 and the front/rear arms 81 and 86 , and may be composed of only arm members without combining the transmission mechanism case 72 , for example. Moreover, the rear fork 88 may be comprised by a single member.

The 3rd mounting structure adopts the following configuration, that is, at least one of the pair of left and right auxiliary brackets 151, 151 is composed of the following components: the bracket base half 152 provided on the vehicle frame; Bracket front half 154 on bracket base half 152 .

The collar 155 with the flange 144 may be interposed between at least one of the left and right pair of lower mounting brackets (engine side brackets) 102 and 102 and the pair of left and right auxiliary brackets 141 and 142 .

The engine installation structure in the present invention is suitable for the following two-wheeled vehicles, that is, the two sides of the vehicle body width direction of the vehicle body side bracket provided on the vehicle frame are sandwiched by a pair of left and right engine side brackets provided on the engine. side, and install the engine on the side bracket of the vehicle body through elastic components.

Claims (7)

1. the engine installation structure of an automatic two-wheeled cycle, when trailing wheel swings up and down, trailing wheel supports and also swings up and down with rocking arm, and be arranged at the width over sides of car body direction both sides of the car body lateral bracket of vehicle frame by the driving engine lateral bracket clamping of the pair of right and left that is arranged at driving engine, by elastomeric element with above-mentioned engine installation on above-mentioned car body lateral bracket, it is characterized in that:

Above-mentioned vehicle frame constitutes, and has the auxiliary bracket of pair of right and left, and clamps the driving engine lateral bracket of above-mentioned pair of right and left by the auxiliary bracket of these pair of right and left, and the auxiliary bracket of this pair of right and left has the compartment of terrain and is configured in above-mentioned car body lateral bracket both sides,

Make the above-mentioned car body lateral bracket of motor support bolt-through, the driving engine lateral bracket of above-mentioned pair of right and left and the auxiliary bracket of above-mentioned pair of right and left, thereby these carriages are connected.

2. the engine installation structure of automatic two-wheeled cycle according to claim 1, it is characterized in that: at least one side is arranged at the bracket base halfbody of above-mentioned vehicle frame by following component set-up in the auxiliary bracket of above-mentioned pair of right and left; And the carriage leading section halfbody that is removably mounted on this bracket base halfbody, by above-mentioned motor support bolt this carriage leading section halfbody is connected in above-mentioned driving engine lateral bracket.

3. the engine installation structure of automatic two-wheeled cycle according to claim 1 and 2, it is characterized in that: it constitutes,

Above-mentioned vehicle frame is on the position different with the auxiliary bracket of above-mentioned car body lateral bracket and above-mentioned pair of right and left, and support with above the center of oscillation of rocking arm at above-mentioned trailing wheel, be provided with the car body upper lateral part carriage of pair of right and left, above-mentioned trailing wheel support is installed on above-mentioned driving engine with rocking arm and can swings

Above-mentioned driving engine and is provided with driving engine upper lateral part carriage above above-mentioned center of oscillation on the position different with the driving engine lateral bracket of above-mentioned pair of right and left,

Utilize the car body upper lateral part bracket clamp of above-mentioned pair of right and left to live in to state driving engine upper lateral part carriage, thereby above-mentioned driving engine top is installed in the car body upper lateral part carriage of pair of right and left by the top elastomeric element.

4. the engine installation structure of automatic two-wheeled cycle according to claim 2, it is characterized in that: it constitutes, above-mentioned vehicle frame is provided with below that is disposed at above-mentioned engine cylinder cover and the crossbeam that extends in the width over sides of car body direction, and above-mentioned car body lateral bracket is extended to the back upper place from this crossbeam, on the other hand, the bracket base halfbody of above-mentioned pair of right and left is extended upward from above-mentioned crossbeam, the carriage leading section halfbody of above-mentioned pair of right and left is extended to above-mentioned car body lateral bracket side from the bracket base halfbody of these pair of right and left, and by above-mentioned motor support bolted connection, thereby when observing from the car body side, above-mentioned car body lateral bracket, above-mentioned bracket base halfbody and above-mentioned carriage leading section halfbody are configured to general triangular.

5. according to the engine installation structure of claim 2 or 4 described automatic two-wheeled cycles, it is characterized in that: the bracket base halfbody of above-mentioned pair of right and left is being roughly L word shape when front is observed.

6. according to the engine installation structure of claim 2 or 4 described automatic two-wheeled cycles, it is characterized in that: the carriage leading section halfbody of above-mentioned pair of right and left is with each 2 bracket base halfbody that are incorporated into above-mentioned pair of right and left up and down, and is incorporated into above-mentioned driving engine with a point of connection based on above-mentioned motor support bolt.

7. the engine installation structure of automatic two-wheeled cycle according to claim 1, it is characterized in that: between the auxiliary bracket of the driving engine lateral bracket of above-mentioned pair of right and left and above-mentioned pair of right and left at least about a side, the axle collar that has flange by above-mentioned motor support bolt is installed, and makes the end face of above-mentioned flange towards the driving engine lateral bracket that the axle collar one side who has flange is installed.

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